Biology - Atoms and Bonding

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14 Terms

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Matter

Anything that takes up space and has a mass. All matter is composed of elements.

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Molecule

A group of 2 or more atoms chemically bonded together

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Compound

A type of molecule containing atoms from 2 or more different elements in a fixed ratio

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Atomic Number

Number of protons

Dictates the chemical properties of an atom

Determines what element it is

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Mass number/atomic weight

Number of protons + neutrons

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Electron shell

Energy level

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If electron is added/removed, then

atom is now an ion, which could be positively charged (cation), or negatively charged (anion)

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If neutron is added or removed, then

you create and isotope (no charge change)

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